N4123D V

This aircraft — FAA registration facts

N4123D is a 1957 Helio H-391B (serial 042), registered to Thun Karl J (individual) in Graham, WA. Its FAA registration is recorded as v and expires February 2030; the airworthiness certificate dates from March 1957 (69 years ago). It carries a Lycoming GO-435C&D SER engine rated at 260 hp, the engine on 57% of registered Helio H-391Bs. Its Mode-S transponder broadcasts the ICAO 24-bit address A4DE53. It is one of 16 Helio H-391B aircraft on the FAA registry. Thun Karl J holds 2 aircraft on the registry.

Registered owner

Thun Karl J

Owner type

Individual

Based in

Graham, WA

Serial number

042

Year built

1957 · 69 yrs old

Airworthiness class

1

FAA status

V

Mode-S / ICAO24

A4DE53 · 51157123 octal

Certificate issued

Mar 3, 1978

Airworthiness date

Mar 26, 1957

Last FAA activity

Oct 7, 2023

Registration expires

Feb 28, 2030

FAA region

S

Source: FAA aircraft registry (public record). Community reviews and photos below.

Engine on this aircraft

Engine

Lycoming GO-435C&D SER

Engine type

Reciprocating (Piston)

Rated power

260 hp

Power per seat

65 hp

FAA engine code

41521

8 of the 14 registered Helio H-391B carry this engine (57%), across 3 engine variants on the type.

Source: FAA engine reference (ENGINE.txt), matched on this registration's engine code.

Community facts about N4123D

Reported by pilots, owners and enthusiasts — community-reported and admin-checked before they publish. Always verify anything important against the aircraft's records.